Headphone



FIG. 1 is a perspective view of a headphone showing my new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a rear side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof.

The broken lines depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for a headphone, as shown and described. 